Rotary-web offset printing press



' Feb 1 g 1927.

B. J. J. GOULDING ROTARY WEB OFF-SET PRINTING PRESS Filed July 5, 1924 Patented Feb. 1, 1927.

Ul'l E P fit. t l l 7f BENJAMIN JOSEPH JOHN GOULDING, 0F ALTRINCHAM, ENGLAND, ASSIGNOR TO LINOTYPE AND MACHINERY LIMITED, OF LONDON, ENGLAND, A BRITISH CUM- PANY.

ROTARY- EE UIEFSET PRINTING PRESS.

Application filed July 5, 1924;, Serial No. 724,-3'2'6, and in Great Britain July 12, 1923.

This invention relates to rotary web offset printing presses and it has for itsobject to provide new or improved means whereby the web can be maintained taut while it is passing between the printing couple.

The invention will be best understood by reference to the accompanying drawing which is a side elevation of one constructional form, only such parts of the printing press being shown as are considered to'be pertinent to the invention.

In the constructional form represented there are provided two rollers 1, 2 hereinafter term-ed guide rollers, adapted to rotate about stationary shafts 8, l respectively, located respectively above and below the printing line X between the two transfer cylinders 5, 6. The guide rollers 1, 2 are adapted to contact with respectively opposite sides of the web 7 throughout its width, and are so located that said web travels upwards in a straight path from the guide roller 2 to the line X along which printing is effected, herein termed the printing line, and thence to the guide roller 1.

Upon each of the shafts 3, at, there are pivoted two levers 8 one at either side of the press, in each of which is journalled one end of a so-called tension roller 9, 10 respectively, which constantly held by pressure of a spring 11 in contact with the side of the web which is opposite to that in contact with the respective guide roller 1 or 2, the pressure exerted by the two tension rollers 9, 10 being such as to maintain the web taut and to prevent it from contacting with the cylinders 53, 6 when these latter are tripped.

Each of the springs 11 (which, in the example under review, are of the CO1l1p1I'9S sion type) encircles a rod 12 which, at one end, is pivoted to the respective lever 8, and at the other end is axially slidable in a guide 13 pivotally mounted on the frame 14.

15, 15 are the two form cylinders from which the transfer cylinders 5, 6 receive the impressions which later are re-transferrcd to the web 7.

It is to be understood that the before described arrangement is capable of being modified without departure from the essential features of the invention, for example,

instead of the pressure which is exerted on i the rollers 9, 10, being derived from springs, it may be exerted by weights or other deonly in a relative sense and are intended,

wherever the context admits of it, to include arrangements wherein the web passes between a printing couple in other thana vertical direction.

Having described my invention, I declare that what I claim and desire to secure by Letters Patent is 1. In a rotary web offset printing press, the combination with a printing couple of two rollers located one on either side of the printing line of the couple and adapted to rotate in contact with respectively opposite sides of the web without deflecting it from the straight path pursued by it through the printing couple, two other rollers each cooperating with one of the first-named rollers and adapted to rotate in contact with the side of the web opposite to that with which the said first-named roller. contacts, and means adapted to press said other rollers against the respective side of the web beyond the two first-named rollers so as to de fleet the web partly around the latter.

2. in a rotary web offset printing press, the combination with a printing couple of two rollers located one on either side of the printing couple contacting with respectively opposite sides of the web, stationary shafts on which said rollers are adapted. to rotate, two tension rollers each cooperating with one of the first-named rollers and adapted to rotate in contact with the side of the web opposite to that with which said first-named roller contacts, two pivoted levers on each of said stationary shafts in which the ends of the respective tension roller are journalled, a rod pivoted to the free end of each of said levers, a guide in the main frame of the press in which each said rod is axially slidable and a spring acting on each of said rods constantly tending to press the respective tension roller against the web so as to defleet the web partly around the respective first-named roller.

In testimony whereof I have affixed my signature hereto.

BENJAMIN JOSEPH JOHN GOULDlNG. 

